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A brilliant scientist working on atom-powered motors is kidnapped and taken to a mysterious island where the master villain, in usual cliffhanger form, hopes to conquer the world and gives our hero a hell of a time! Jack Armstrong, of course, thwarts these evil plans in the nick of time. Good, clean fun filled with exciting chases, fights and thrills thru 15 chapters. For those old enough to remember, you can almost hear the announcer on the old radio show saying in a hushed voice...Well, boys and girls. You'll remember that yesterday when we left Jack, Uncle Jim, Billy and Betty they were just ready to...!